import pyautogui

def move_mouse_to(screen_area, width_percentage, height_percentage):
    """
    Moves the mouse to a position within a given screen area based on width and height percentages.

    :param screen_area: A tuple of four numbers representing the screen area (e.g., (left, top, right, bottom)).
    :param width_percentage: The width percentage (e.g., 50 for 50%).
    :param height_percentage: The height percentage (e.g., 50 for 50%).
    """
    left, top, right, bottom = screen_area
    width = right - left
    height = bottom - top

    target_x = left + width * (width_percentage / 100)
    target_y = top + height * (height_percentage / 100)

    pyautogui.moveTo(target_x, target_y)
